Steps to reproduce:

1) Open Unity Hub and create a new 3D project
2) Go to Unity >> Preferences>> External tools
3) Delete paths for SDK and NDK
4) Restart Unity and click No when it finds SDK path automatically
5) Switch platform to Android in Build Settings
6) Click on the Player Settings button
Observe: Editor crash

Reproduced with:
2019.1.0b9, 2019.1.0b10, 2019.1.0f1,
2019.2.0a7, 2019.2.0a8, 2019.2.0a10

Not reproduced with:
2018.3.12f1
2019.1.0b8
2019.2.0a2, 2019.2.0a5, 2019.2.0a6

Regression since:
2019.1.0b9
2019.2.0a7

Reproduced with:
MacBook Pro Intel Core i7 2,8 GHz 16 GB ; Intel HD Graphics 630 1536 MB Radeon Pro 555 2048 MB ; Mac OS X 10.14.3 18D109 Darwin 18.2.0

Not reproduced with:
Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz; NVIDIA GeForce GTX 1050 Ti NVIDIA GeForce GTX 1050 Ti; Windows 10 (10.0.0) 64bit